JP2024510602A - Power storage source management device and its control method - Google Patents

Abstract

The present invention discloses a power storage source management device and a control method thereof. In the management device according to the present invention, the control unit determines an operating power limit of the power storage source by acquiring operating characteristic information of the power storage source from the sensor unit, and transmits the operating characteristic information while the power storage source is operating. is used to determine a charging power or discharging power of a power storage source, and the charging power or the discharging power is greater than a preset unstable power range of the power conversion system (PCS) and less than the operating power limit. interrupting the operation of the power storage source when a first operation interruption condition that is greater than or equal to a first threshold is met, and the charging power or the discharging power is within a preset unstable power range of the PCS and is configured to suspend operation of the power storage source when a second operation suspension condition is met that is greater than or equal to a second threshold (greater than the first threshold) than the operating power limit. Ru.

Description

The present invention relates to a power storage source management device and a control method thereof, and more particularly, the present invention relates to a power storage source management device and a control method thereof, and more particularly, in the process of charging or discharging the power storage source, charging or discharging of the power storage source is interrupted in the latter half of charging or discharging. The present invention relates to a power storage source management device and its control method that can prevent this phenomenon.

This application claims priority based on Korean Patent Application No. 10-2021-0149215 filed on November 2, 2021, and all contents disclosed in the specification and drawings of the application are incorporated into this application. It will be done.

Recently, interest in energy has increased explosively around the world due to resource depletion and serious climate change. Along with this, smart grid and renewable energy technologies are in the spotlight. Renewable energy has the disadvantage that the supply of energy is not constant, so technology is needed to compensate for this.

Energy storage systems (ESS) are used to compensate for the shortcomings of renewable energy and to build smart grids more efficiently.

ESS stores electricity produced through renewable energy or unused or excess electricity in the electricity grid in an electricity storage source, and supplies the stored electricity to the electricity system when electricity is needed. This is a system that increases usage efficiency.

The ESS includes a power storage source including a plurality of batteries, a power conversion system (PCS), an energy management system (EMS), and the like.

The PCS converts the characteristics of current to output the power stored in the power storage source to the system, and performs functions such as monitoring and control, independent operation, and coordinated protection of the system. The EMS is responsible for overall management of the ESS and, in particular, for adjusting the charging and discharging conditions of the power storage sources so that the ESS can be operated more efficiently.

The PCS charges the power storage source using power supplied from the power grid or renewable energy power plants in accordance with operational policies set by the EMS. The PCS also discharges power storage sources to provide power to the power system in accordance with operational policies set by the EMS.

The PCS has controllable power specifications. For example, if the power specification of the PCS is 5000 kW, the PCS can provide up to 5000 kW of charging power to the power storage source, or can provide up to 5000 kW of discharge power from the power storage source.

The PCS monitors power line voltages and currents to ensure that the charging and discharging power of the power storage source does not exceed controllable power specifications. The voltage measurement sensor and current measurement sensor included in the PCS have measurement errors. If the voltage measurement sensor and the current measurement sensor have an error within 1%, the accuracy of power control of the PCS may decrease when charging power and discharging power are low. In the above example, the power corresponding to a 1% error is 50 kW. Therefore, when the charging power and the discharging power are 50 kW or less, there is a possibility that the accuracy of power control of the PCS may be reduced. Hereinafter, the power specification area in which the accuracy of PCS power control decreases will be defined as an unstable power range.

The power storage source has a management device. The management device determines an allowable operating power limit for the power storage source based on the state of charge and temperature of the power storage source. The operating power limit is the maximum amount of charging or discharging power that the power storage source can tolerate. If the charging power input to the power storage source or the discharging power output from the power storage source exceeds the operating power limit by a predetermined percentage, the power storage source management device may interrupts charging/discharging. For example, if exceeding the operating power limit by 10 to 20% is set as a charging/discharging interruption condition, the management device will control the power storage if the charging power or discharging power of the power storage source exceeds the operating power limit by 10 to 20%. Immediately stop charging or discharging the power source.

The power range in which the accuracy of power control of the PCS decreases is when the state of charge of the power storage source is close to full charge or close to complete discharge. This is because the nearer the fully charged or fully discharged state is, the lower the charging power or discharging power becomes, and eventually becomes lower than the unstable power range of the PCS.

As described above, in the unstable power range, the accuracy of PCS power control decreases. That is, it becomes difficult to accurately control charging power and discharging power to the level required by the power storage source management device. Therefore, in the unstable power range, events corresponding to charging/discharging interruption conditions frequently occur. That is, the charging power supplied to the power storage source or the discharging power output from the power storage source frequently exceeds the operating power limit by a predetermined percentage. For these reasons, a phenomenon occurs in which the power storage source cannot be fully charged or completely discharged and suddenly stops operating.

The present invention has been devised in the background of the prior art as described above, and the present invention provides a method for storing power even if the charging power or discharging power of the power storage source becomes low below the unstable power range of the PSC. It is an object of the present invention to provide a power storage source management device and a control method thereof that have an improved control logic so as to prevent the phenomenon that the operation of the power source suddenly stops.

A power storage source management device according to one aspect of the present invention for achieving the above technical problem includes: a sensor unit that measures operating characteristics of the power storage source; a control unit operably coupled to the sensor unit; including.

Preferably, the control unit (i) obtains operating characteristic information of the power storage source from the sensor unit to determine an operating power limit of the power storage source, and (ii) determines the operating power limit of the power storage source while the power storage source is operating. determining charging power supplied from a power conversion system (PCS) or discharging power provided to the PCS side using the operating characteristic information, and (iii) determining whether the charging power or the discharging power is operation of the power storage source when a first operation interruption condition is met that is greater than a set unstable power range and the charging power or the discharging power is greater than or equal to a first threshold value than the operating power limit; (iv) the charging power or the discharging power is within a preset unstable power range of the PCS, and the charging power or the discharging power is lower than the operating power limit at a second threshold ( The power storage source may be configured to suspend operation of the power storage source if a second operation suspension condition that is greater than or equal to a first threshold is met.

According to one aspect, the control unit receives operating characteristic information including charging/discharging current, voltage, and temperature of the power storage source from the sensor unit, and totals the charging/discharging current to determine the power storage source. Determining a state of charge and determining the operating power limit of the power storage source corresponding to the determined state of charge and the received temperature with reference to lookup information defining a correlation between the state of charge and the temperature and the operating power limit. may be configured to determine.

According to another aspect, the controller may be provided with information regarding a preset unstable power range of the PCS from the PCS.

Preferably, the first threshold may be between 10% and 30% of the operating power limit. Also, the second threshold may be between 30% and 60% of the operating power limit.

Optionally, the second threshold may increase as the charging power or discharging power of the power storage source becomes lower.

According to yet another aspect, the power storage source may include first to nth battery racks.

A power storage source management device according to another aspect of the present invention for achieving the above-mentioned technical problem includes first to nth slave control units installed in each of the first to nth battery racks; - a master control unit communicatively coupled to the n-th slave control unit.

Each of the first to nth slave control units obtains operating characteristic information of the battery rack to which it is attached from the sensor unit, and uses the operating characteristic information to determine the operating power limit and charging power or discharging power of the battery rack. may be configured to determine and provide the determined information to the master control unit.

Preferably, the master control unit adds up the operating power limit and charging power or discharging power transmitted from the first to nth slave control units to determine the total operating power limit and the total charging power or the total charging power. determining a discharge power, wherein the total charging power or the total discharge power is greater than a preset unstable power range of the PCS, and the total charging power or the total discharge power is the total operating power limit; If a first operation interruption condition, which is greater than or equal to a first threshold, is satisfied, an operation interruption message is provided to the first to nth slave controllers, and the total charging power or the total discharging power is is within a preset unstable power range, and the total charging power or the total discharging power is greater than or equal to a second threshold (greater than the first threshold) than the total operating power limit. If the second operation suspension condition is met, the apparatus may be configured to provide an operation suspension message to the first to nth slave controllers.

A method for controlling a power storage source management device according to still another aspect of the present invention for achieving the above technical problem includes acquiring operational characteristic information of the power storage source from a sensor unit that measures the operational characteristics of the power storage source. determining an operating power limit for the power storage source using the operating characteristic information; and using the operating characteristic information to determine an operating power limit for the power storage source while the power storage source determining the charging power supplied from the PCS or the discharging power provided to the PCS side; the charging power or the discharging power is larger than a preset unstable power range of the PCS; suspending operation of the power storage source when a first operation suspension condition is met, in which the discharge power is greater than or equal to a first threshold value than the operating power limit; a second operation interruption in which the charging power or the discharging power is within a preset unstable power range of the PCS and is greater than or equal to a second threshold (greater than the first threshold) than the operating power limit; suspending operation of the power storage source if a condition is met.

A method for controlling a power storage source management device according to still another aspect of the present invention for achieving the above technical problem includes first to nth slave control units respectively installed in first to nth battery racks; A control method for a power storage source management device including: a master control unit communicatively coupled to the first to nth slave control units, wherein each of the first to nth slave control units , acquiring operating characteristic information from a sensor unit that measures operating characteristics of a battery rack equipped with the battery rack, determining an operating power limit and charging power or discharging power of the battery rack, and providing the determined operating characteristic information to the master control unit; The master control unit adds up the operating power limit and charging power or discharging power transmitted from the first to nth slave control units to determine the entire operating power limit and the entire charging power or the entire discharging power. and the master control unit determines that the total charging power or the total discharging power is larger than a preset unstable power range of the PCS, and the total charging power or the total discharging power is providing an operation suspension message to the first to nth slave controllers when a first operation suspension condition that is greater than or equal to a first threshold than an operating power limit of the master controller; the total charging power or the total discharging power is within a preset unstable power range of the PCS, and the total charging power or the total discharging power is less than the total operating power limit. providing an operation suspension message to the first to nth slave controllers when a second operation suspension condition that is equal to or greater than a threshold (greater than the first threshold) is satisfied; The n-slave control unit may include the step of suspending the operation of the battery rack to which it is attached in response to receiving the operation suspension message.

According to the present invention, the charging/discharging interruption condition is relaxed when the charging power or discharging power of the power storage source becomes lower than the unstable power range of the PCS. Therefore, the power storage source can be charged to a fully charged state and discharged to a fully discharged state while preventing the phenomenon that the operation of the power storage source is interrupted during the latter half of charging or the latter half of discharging. This allows maximum utilization of the capacity of the power storage source.

The drawings attached to this specification illustrate the preferred embodiments of the present invention, and serve to further understand the technical idea of the present invention as well as the contents of the invention. The interpretation should not be limited to the matters shown in the drawings.

1 is a schematic configuration diagram of a power storage source management device according to a first embodiment of the present invention; FIG. FIG. 2 is a schematic configuration diagram of a power storage source management device according to a second embodiment of the present invention. FIG. 3 is a flow diagram of a method for controlling a power storage source management device according to the first embodiment of the present invention. FIG. 7 is a flow diagram of a method for controlling a power storage source management device according to a second embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms and words used in this specification and the claims are not to be construed to be limited to their ordinary or dictionary meanings, and the inventors themselves have expressed their intention to explain the invention in the best manner possible. In accordance with the principle that the concept of a term can be appropriately defined in order to understand the meaning and concept of the present invention, the meaning and concept thereof shall be interpreted in accordance with the technical idea of the present invention. Therefore, the embodiments described in this specification and the configurations shown in the drawings are only one of the most preferred embodiments of the present invention, and do not represent the entire technical idea of the present invention. It is to be understood that there may be various equivalents and modifications to these at this point.

FIG. 1 is a schematic configuration diagram of a power storage source management device 10 according to a first embodiment of the present invention.

Referring to FIG. 1 , a power storage source management device 10 according to the first embodiment is coupled to a power storage source 11 . Power storage source 11 is connected to PCS 13 via switch 12 . The PCS 13 is included in the ESS and converts the characteristics of current in order to output the electric power stored in the electric power storage source 11 to the system or to supply the electric power of the system to the electric power storage source 11. , monitoring and control, independent operation, system coordination protection functions, etc.

Power storage source 11 includes a plurality of battery cells 14 . Multiple battery cells 14 may be connected in series and/or in parallel. In one example, multiple batteries may be mounted on a battery rack. A battery rack is widely used in ESS, and includes a rack structure on which a plurality of battery cells 14 can be loaded. Preferably, the battery rack may be a component included in the ESS.

The plurality of battery cells 14 may be lithium ion batteries, but the present invention is not limited by the type of battery cells 14.

The switch 12 is a component that connects or disconnects the PCS 13 and the power storage source 11. Switch 12 may be a relay switch or a power semiconductor switch. However, the present invention is not limited to the type of switch 12.

The power storage source management device 10 includes a sensor unit 15 that measures the operating characteristics of the power storage source 11 . Preferably, the sensor section 15 includes a voltage measurement section 15a, a current measurement section 15b, and a temperature measurement section 15c.

The voltage measurement unit 15a measures the voltage of each battery cell at regular time intervals while the plurality of battery cells 14 are being charged or discharged, and outputs the voltage measurement value to the control unit 16.

The voltage measurement section 15a may be a voltage measurement circuit known in the art. Since voltage measurement circuits are well known, detailed description thereof will be omitted.

The current measurement unit 15b measures the charging/discharging current flowing through the plurality of battery cells 14 at regular time intervals, and outputs the current measurement value to the control unit 16.

Current measurement section 15b may be a current measurement circuit known in the art. The current measuring section 15b may be a Hall sensor or a sense resistor that outputs a voltage value corresponding to the magnitude of the current. Voltage values can be converted to current values using Ohm's law.

The temperature measurement unit 15c measures the temperature of each battery cell 14 at regular time intervals while the plurality of battery cells 14 are being charged or discharged, and outputs the temperature measurement value to the control unit 16.

The temperature measurement section 15c may be a temperature measurement circuit known in the art. The temperature measurement unit 15c may be a thermocouple or a temperature measurement element that outputs a voltage value corresponding to temperature. Voltage values can be converted to temperature values using a voltage-to-temperature conversion lookup table (function).

The power storage source management device 10 includes a control unit 16 . The control unit 16 acquires operating characteristic information of the power storage source 11 from the sensor unit 15 and determines an operating power limit of the power storage source 11 . The operating characteristic information relates to the voltage, charging/discharging current, and temperature of the plurality of battery cells 14 included in the power storage source 11. Further, the operating power limit is the maximum value of charging power that can be applied to the power storage source 11 or the maximum value of the discharging power that can be output from the power storage source 11 to the system.

The control unit 16 determines the state of charge of each battery cell by accumulating the charging/discharging current for each of the plurality of battery cells 14, and adds up the state of charge of the battery cells to determine the state of charge (SOC: State of Charge).

A coulomb counting method known in the technical field to which the present invention belongs is used to calculate the cumulative charge/discharge current. Upon accumulating the charge/discharge current, the initial state of charge may be determined using the stabilized voltage measured after the plurality of battery cells 14 maintain an unloaded state for a predetermined period of time. That is, with reference to lookup information that predefines the correlation between the stabilization voltage and the state of charge, the state of charge corresponding to the stabilization voltage is looked up, and the looked-up state of charge is used as the initial value of the state of charge. Can be set.

In another example, the control unit 16 determines the state of charge of each battery cell by inputting information regarding the voltage, charging/discharging current, and temperature of each of the plurality of battery cells 14 into an extended Kalman filter, and determines the state of charge of each battery cell. The state of charge may be summed to determine the state of charge of the power storage source 11. Extended Kalman filters capable of determining the state of charge from battery cell voltage, charge/discharge current and temperature are already known in the art.

Estimating the state of charge using an extended Kalman filter is described, for example, in the paper by Gregory L. Plett, "Extended Kalman filtering for battery management systems of LiPB-based HEV bat. ery packs Parts 1, 2 and 3” ( Journal of Power Source 134, 2004, 252-261), the above-mentioned article may be incorporated as part of this specification.

Preferably, the control unit 16 determines the current state of charge and current temperature of the power storage source 11 by referring to lookup information that defines the correlation between the state of charge and temperature of the power storage source 11 and the operating power limit. A corresponding operating power limit may be determined.

The power storage source 11 is kept at a uniform temperature by a heating, ventilation, & air conditioning (HVAC) device. Therefore, the temperature of the power storage source 11 may be the average temperature of the battery cells. Alternatively, the temperature of power storage source 11 may be the maximum temperature of the battery cells.

The operating power limit can be determined by other known methods in addition to the method of referring to lookup information, so the present invention is not limited in any way by the specific method of determining the operating power limit. .

The control unit 16 also determines the charging power supplied from the PCS 13 to the power storage source 11 while the power storage source 11 is being charged or discharged, or the discharging power provided from the power storage source 11 to the PCS 13 side. It is possible.

For this purpose, the control unit 16 may determine the charging power or the discharging power by multiplying the total voltage of the plurality of battery cells 14 by the charging/discharging current. The total voltage may be determined by summing the voltages of each battery cell. The voltage and charging/discharging current of each battery cell are obtained by referring to the operating characteristic information obtained through the sensor unit 15.

The control unit 16 directly measures the current and voltage of the power line to which the PCS 13 and the power storage source 11 are connected, and determines whether the charging power is supplied from the PCS 13 to the power storage source 11 or from the power storage source 11 to the PCS 13. may determine the discharge power provided to the side. In this case, the power storage source management device 10 may separately include a current measuring unit (not shown) and a voltage measuring unit (not shown) for monitoring the current and voltage of the power line.

The control unit 16 determines whether the charging power or discharging power of the power storage source 11 belongs to the unstable power range set in advance of the PCS 13, and whether the charging power or discharging power is greater than the operating power limit by a threshold value or more. The operation of the power storage source 11 can be maintained or interrupted based on the determination.

According to one aspect, the control unit 16 controls the power storage source 11 so that the charging power or the discharging power is larger than a preset unstable power range of the PCS 13, and the charging power or the discharging power is within the operating power limit of the power storage source 11. It can be determined whether or not the condition (first operation interruption condition) that the first threshold value is greater than or equal to the first threshold value is satisfied. If the first operation interruption condition is met, the controller 16 may turn off the switch 12 to interrupt charging or discharging of the power storage source 11. Conversely, if the first operation interruption condition is not met, the controller 16 may keep the switch 12 turned on to maintain charging or discharging of the power storage source 11.

According to another aspect, the control unit 16 is configured such that the charging power or the discharging power of the power storage source 11 is within a preset unstable power range of the PCS 13, and the charging power or the discharging power is the operating power of the power storage source 11. It can be determined whether a condition (second operation interruption condition) that the limit is greater than or equal to a second threshold (larger than the first threshold) is satisfied. If the second operation interruption condition is met, the controller 16 may turn off the switch 12 to interrupt charging or discharging of the power storage source 11. Conversely, if the second operation interruption condition is not met, the controller 16 may keep the switch 12 turned on to maintain charging or discharging of the power storage source 11.

The first threshold may be set at 10% to 30% with respect to the operating power limit. In this case, the control unit 16 controls the power storage source 11 so that the charging power or the discharging power is larger than the preset unstable power range of the PCS 13, and the charging power or the discharging power is 10% higher than the operating power limit of the power storage source 11. % to 30% or more is met, the operation of the power storage source 11 may be interrupted.

The second threshold may be set between 30% and 60% with respect to the operating power limit. In this case, the control unit 16 determines that the charging power or discharging power of the power storage source 11 is within the preset unstable power range of the PCS 13, and that the charging power or discharging power is 30% lower than the operating power limit of the power storage source 11. % to 60% or more is met, the operation of the power storage source 11 may be interrupted.

According to the present invention, the second operation interruption condition is applied when the charging power or discharging power of the power storage source 11 is within the preset unstable power range of the PCS 13. The unstable power range is due to PCS voltage and current measurement errors. In one example, if the voltage and current measurement error is 1%, the unstable power range is the power range corresponding to the output specification of the PCS times the measurement error. If the PCS output specification is 5000kW, the unstable power range is from 0 to 50kW.

The charging power or discharging power of the power storage source 11 enters the unstable power range when the power storage source 11 approaches a fully charged state or a fully discharged state. At this time, since the charging power or the discharging power becomes very low, no safety problem arises even if the second threshold value is increased more than the first threshold value. Since the power storage source 11 includes a plurality of battery cells 14, even if the second threshold is greater than the first threshold, there is a concern about the degree to which the operating power limit will be exceeded from the perspective of each battery cell. It's not at the level where it should be done.

As described above, when the charging power or discharging power of the PCS 13 enters the unstable power range, if the charging/discharging interruption condition of the power storage source 11 is increased from the first threshold to the second threshold, It is possible to solve the problem that the operation of the power storage source 11 is abruptly interrupted during the second half of charging or the second half of discharging, without causing safety problems of the battery cells, and to switch the power storage source 11 from a fully charged state. It can be used up to a fully discharged state. Thereby, energy usage efficiency can be improved.

On the other hand, the second threshold may be adaptively changed depending on the level of charging power or discharging power of the power storage source 11. In one example, the charging power or discharging power of the power storage source 11 belongs to the preset unstable power range of the PCS 13, and the smaller the value thereof, the further the second threshold may be increased stepwise. . This is because the lower the charging or discharging power, the less likely battery cell safety problems will occur.

The power storage source management device 10 may further include a storage medium 17 and a communication interface 18 .

The type of storage medium 17 is not particularly limited as long as it can record and erase data and/or information. As an example, the storage medium 17 is a random access memory (RAM), a read-only memory (ROM), a register, a flash memory, a hard disk, or a magnetic recording medium. It can be.

The storage medium 17 can be electrically connected to the control unit 16 via, for example, a data bus so that the storage medium 17 can be accessed by the control unit 16.

The storage medium 17 stores programs including various control logics executed by the control unit 16, and/or data generated when the control logics are activated, and/or preset data, parameters, lookup information/tables, etc. storing and/or updating and/or erasing and/or transmitting.

The control unit 16 transmits and receives information and/or data to and from the PCS 13 via the communication interface 18 . Preferably, the control unit 16 may receive information regarding the unstable power range of the PCS 13 via the communication interface 18 and record it on the storage medium 17 . The information regarding the unstable power range stored in the storage medium 17 can be referred to when determining whether the first operation interruption condition and the second operation interruption condition are satisfied.

Further, the control unit 16 can transmit the operating power limit to the PCS 13 via the communication interface 18. Then, the PCS 13 supplies charging power to the power storage source 11 so as not to exceed the operating power limit. At this time, the PCS 13 converts the AC power of the power grid into DC power corresponding to the charging power, and provides the DC power to the power storage source 11 . In addition, the PCS 13 may be provided with discharge power in the form of DC from the power storage source 11, up to an operating power limit, and may convert the DC to AC and supply it to the power grid.

Communications interface 18 may be any known wired or wireless communications interface that supports short-range or long-range communications. As an example, the communication interface 18 may include a controller area network (CAN) communication interface, a daisy-chain interface, an Ethernet communication interface, WI-FI, Bluetooth (registered trademark), or ZigBee ( (registered trademark), etc., but the present invention is not limited thereto.

FIG. 2 is a schematic configuration diagram of a power storage source management device 20 according to a second embodiment of the present invention.

Referring to FIG. 2, in the second embodiment, the power storage source 11 includes first to nth battery racks 11-1 to 11-n. Each battery rack includes a plurality of battery cells connected in series and/or in parallel, similar to the power storage source 11 of the first embodiment.

The power storage source management device 20 includes first to nth slave control units 16-1 to 16-n coupled to first to nth battery racks 11-1 to 11-n, respectively. The first to nth slave control units 16-1 to 16-n are connected to the first to nth sensor units 15-1 to 15-n respectively coupled to the first to nth battery racks 11-1 to 11-n. including. Each of the first to n-th sensor sections 15-1 to 15-n includes a voltage measurement section 15a, a current measurement section 15b, and a temperature measurement section 15c, similarly to the first embodiment.

The power storage source management device 20 also includes first to nth storage media 17-1 to 17-n coupled to first to nth slave control units 16-1 to 16-n, respectively. Further, the power storage source management device 20 includes first to nth communication interfaces 18-1 to 18-n coupled to first to nth slave control units 16-1 to 16-n, respectively. The configurations regarding the first to nth storage media 17-1 to 17-n and the first to nth communication interfaces 18-1 to 18-n are substantially the same as in the first embodiment.

Furthermore, the power storage source management device 20 includes a master control unit 21 . Master controller 21 may be operably coupled with storage medium 22 and communication interface 23 . The configuration of the storage medium 22 and communication interface 23 is substantially the same as the storage medium 17 and communication interface 18 of the first embodiment.

The master control unit 21 can send and receive data and/or information to and from the first to nth slave control units 16-1 to 16-n via the communication interface 23.

In the following explanation, when the master control unit 21 and the first to nth slave control units 16-1 to 16-n transmit and/or receive data and/or information, the communication interfaces 18-1 to 18-n and 23 are used. It is clear that this should be done. Therefore, when describing transmission and reception of data and/or information between control units, reference to the communication interface will be omitted.

Preferably, the first to nth slave control units 16-1 to 16-n perform substantially the same operation.

Specifically, the first slave control unit 16-1 acquires operating characteristic information from the sensor unit 15-1 that measures the operating characteristics of the first battery rack 11-1 equipped with it, and The operating power limit of 11-1 is determined and transmitted to the master control unit 21 side through communication. The second slave control unit 16-2 to the n-th slave control unit 16-n also determine the operating power limits of the second to n-th battery racks 11-2 to 11-n to which they are installed, and communicate through communication. It is transmitted to the master control unit 21. The method of determining the operating power limit is substantially the same as in the first embodiment.

The first slave control unit 16-1 also determines charging power or discharging power while the first battery rack 11-1 is being charged or discharged, and transmits the charging power or discharging power to the master control unit 21 through communication. provide. The second slave control unit 16-2 to the n-th slave control unit 16-n also determine the charging power or the discharging power of the second to n-th battery racks 11-2 to 11-n to which they are attached, and perform communication. The data is transmitted to the master control unit 21 through. The method for determining charging power or discharging power is substantially the same as in the first embodiment.

When the operating power limit is transmitted from the first to nth slave control units 16-1 to 16-n, the master control unit 21 adds up all the values and sets the operating power limit to the first to nth battery racks 11-1 to 11. −n overall operating power limit may be determined.

Further, when the charging power or discharging power is transmitted from the first to nth slave control units 16-1 to 16-n, the master control unit 21 adds up all the values and controls the first to nth battery racks 16-n. -1 to 11-n total charging power or total discharging power may be determined.

Furthermore, according to one aspect, the master control unit 21 is configured such that the total charging power or the total discharging power is larger than a preset unstable power range of the PCS 13, and the total charging power or the total discharging power is It is determined whether or not a condition (a first operation interruption condition) that the operating power limit is greater than or equal to a first threshold value is satisfied. Preferably, the first threshold may be set to 10% to 30% of the overall operating power limit, similar to the first embodiment, although the present invention is not limited thereto.

If the first operation suspension condition is satisfied, the master control unit 21 transmits an operation suspension message to the first to nth slave control units 16-1 to 16-n through communication. On the other hand, if the first operation interruption condition does not hold, the master control unit 21 transmits an operation maintenance message to the first to n-th slave control units 16-1 to 16-n through communication.

According to another aspect, the master control unit 21 is configured such that the total charging power or the total discharging power is within a preset unstable power range of the PCS 13, and the total charging power or the total discharging power is It is determined whether a condition (second operation interruption condition) that the power is greater than or equal to a second threshold (greater than the first threshold) is satisfied than the power limit. Preferably, the second threshold may be set to 30% to 60% of the overall operating power limit, similar to the first embodiment, although the present invention is not limited thereto.

If the second operation suspension condition is satisfied, the master control unit 21 transmits an operation suspension message to the first to nth slave control units 16-1 to 16-n through communication. On the other hand, if the second operation interruption condition does not hold, the master control unit 21 transmits an operation maintenance message to the first to n-th slave control units 16-1 to 16-n through communication.

When the first slave control unit 16-1 receives the operation interruption message from the master control unit 21 through communication, it turns off the switch 12-1 disposed on the first battery rack 11-1 to which it is attached. Charging or discharging of the first battery rack 11-1 is interrupted. On the other hand, if the first slave control unit 16-1 receives the operation maintenance message from the master control unit 21 through communication, the switch 12-1 installed in the first battery rack 11-1 equipped with the first slave control unit 16-1 The turned-on state is maintained to continue charging or discharging the first battery rack 11-1.

Similarly to the first slave control unit 16-1, the second to nth slave control units 16-2 to 16-n also interrupt the operation of the battery racks to which they are attached if they receive the operation interruption message through communication. However, if it receives an operation maintenance message through communication, it continues to maintain the operation of the battery rack to which it is attached.

FIG. 3 is a flow diagram of a method for controlling a power storage source management device according to the first embodiment of the present invention.

The method shown in FIG. 3 is a control method for the power storage source management device 10 according to the first embodiment, and unless otherwise specified, the main body of execution of the steps in FIG. 3 is the control method of the first embodiment. This is part 16. Also, the steps in FIG. 3 may be repeated periodically at regular time intervals.

Referring to FIGS. 1 and 3, in step S10, the control unit 16 acquires operating characteristic information of the power storage source 11 from the sensor unit 15.

Next, in step S20, the control unit 16 determines the operating power limit of the power storage source 11 using the operating characteristic information.

Next, in step S30, the control unit 16 determines the charging power supplied from the PCS 13 to the power storage source 11 or the discharging power supplied from the power storage source 11 to the PCS 13 side.

Next, in step S40, the control unit 16 determines whether the charging power or discharging power of the power storage source 11 is larger than a preset unstable power range of the PCS 13.

If the determination in step S40 is YES, the control unit 16 determines in step S50 that the charging power or discharging power of the power storage source 11 is lower than the first operating power limit corresponding to the charging state and temperature of the power storage source 11. Determine whether it is greater than or equal to the threshold.

If the determination in step S50 is YES, the control unit 16 turns off the switch 12 disposed on the power line and interrupts the operation of the power storage source 11 in step S70. On the other hand, if the determination in step S50 is NO, the control unit 16 maintains the operation of the power storage source 11 by maintaining the turn-on state of the switch 12 disposed in the power line in step S80.

On the other hand, if the determination in step S40 is NO, the control unit 16 determines in step S60 that the charging power or discharging power of the power storage source 11 is lower than the operating power limit corresponding to the charging state and temperature of the power storage source 11. 2. It is determined whether or not the threshold value is greater than or equal to the second threshold value (larger than the first threshold value).

If the determination in step S60 is YES, the control unit 16 turns off the switch 12 disposed on the power line and interrupts the operation of the power storage source 11 in step S90. On the other hand, if the determination in step S60 is NO, the control unit 16 maintains the operation of the power storage source 11 by keeping the switch 12 disposed on the power line turned on in step S100.

According to the present invention, when the charging power or discharging power of the power storage source 11 falls within the preset unstable power range of the PCS 13, by increasing and easing the charging/discharging interruption condition of the power storage source 11, It is possible to prevent a phenomenon in which the operation of the power storage source 11 is interrupted in the latter half of charging or the latter half of discharging. Thereby, the capacity of the power storage source 11 can be fully utilized by charging the power storage source 11 to a fully charged state and discharging it to a completely discharged state.

FIG. 4 is a flow diagram of a method for controlling the power storage source management device 20 according to the second embodiment of the present invention.

The method shown in FIG. 4 is a control method for the power storage source management device 20 according to the second embodiment, and the main body for executing the steps in FIG. units 16-1 to 16-n, or the master control unit 21. Also, the steps in FIG. 4 may be repeated periodically at regular time intervals.

Referring to FIGS. 2 and 4, in step S200, the first slave control unit 16-1 receives operating characteristic information from the sensor unit 15-1 that measures the operating characteristics of the first battery rack 11-1 equipped with the first slave control unit 16-1. is acquired, determines the operating output limit of the first battery rack 11-1, and provides it to the master control unit 21. The second to nth slave control units 16-2 to 16-n also determine the operating output limits of the second to nth battery racks 11-2 to 11-n, similarly to the first slave control unit 16-1. and provides it to the master control unit 21.

Next, in step S210, the master control unit 21 adds up all the operational output limits transmitted from the first to n-th slave control units 16-1 to 16-n to determine the overall operational output limit.

Next, in step S220, the master control unit 21 controls the entire charging power supplied from the PCS 13 or the entire charging power supplied to the PCS 13 while the first to second battery racks 11-1 to 11-n operate. Determine the discharge power of

In order to determine the entire charging power or the entire discharging power, the first to n-th slave control units 16-1 to 16-n determine the charging power or discharging power of the battery rack to which they are installed and communicate the result. The data can be transmitted to the master control unit 21 through. Then, the master control unit 21 can determine the total charging power or the total discharging power by adding up all the charging power or discharging power of each battery rack. Alternatively, as an alternative, the master control unit 21 measures the voltage and current of the power line using a voltage measurement unit (not shown) and a current measurement unit (not shown) provided on the power line, and By multiplying by the current and the total charging power or the total discharging power can be determined. The method of determining the charging power or discharging power of each battery rack is as described above.

After step S220, step S230 is performed.

In step S230, the master control unit 21 determines whether the total charging power or the total discharging power is larger than a preset unstable power range of the PCS 13.

If the determination in step S230 is YES, the master control unit 21 determines in step S240 whether the total charging power or the total discharging power is greater than or equal to the first threshold value than the total operating output limit. do.

If the determination in step S240 is YES, the master control unit 21 transmits an operation interruption message to the first to nth slave control units 16-1 to 16-n through communication in step S250. Then, in step S260, the first to nth slave control units 16-1 to 16-n turn off the switch of the battery rack to which they are attached, and interrupt the operation of the battery rack.

If the determination in step S240 is NO, the master control unit 21 transmits an operation maintenance message to the first to n-th slave control units 16-1 to 16-n through communication in step S270. Then, in step S280, the first to nth slave control units 16-1 to 16-n maintain the turned-on state of the switch of the battery rack to which they are attached, thereby maintaining the operation of the battery rack.

On the other hand, if the determination in step S230 is NO, the master control unit 21 determines in step S255 that the total charging power or the total discharging power is lower than the second threshold value (the first threshold value) than the total operating output limit. (greater than).

If the determination in step S255 is YES, the master control unit 21 transmits an operation interruption message to the first to nth slave control units 16-1 to 16-n through communication in step S290. Then, in step S300, the first to nth slave control units 16-1 to 16-n turn off the switch of the battery rack to which they are attached, and interrupt the operation of the battery rack.

If the determination in step S255 is NO, the master control unit 21 transmits an operation maintenance message to the first to nth slave control units 16-1 to 16-n through communication in step S310. Then, in step S320, the first to nth slave control units 16-1 to 16-n maintain the turned-on state of the switch of the battery rack to which they are attached, thereby maintaining the operation of the battery rack.

According to the present invention, when the entire charging power or the entire discharging power of the first to nth battery racks 11-1 to 11-n falls within the preset unstable power range of the PCS 13, the first to nth battery racks By increasing and relaxing the charging/discharging interruption conditions for the battery racks 11-1 to 11-n, the operations of the first to n-th battery racks 11-1 to 11-n are interrupted in the second half of charging or the second half of discharging. It is possible to prevent this phenomenon. As a result, the first to nth battery racks 11-1 to 11-n are charged to a fully charged state and discharged to a completely discharged state, and the capacity of the first to nth battery racks 11-1 to 11-n is increased. can be used to the fullest.

In the present invention, the control units 16, 16-1 to 16-n, and 21 may be control circuits. The control units 16, 16-1 to 16-n, and 21 include processors, application specific integrated circuits (ASICs), and processors known in the art to activate the various control logics described above. Other chipsets, logic circuits, registers, communications modems, data processing equipment, etc. may optionally be included. Furthermore, when the control logic is implemented by software, the control units 16, 16-1 to 16-n, and 21 may be implemented by a set of program modules. The program modules may then be stored in memory and activated by the processor. The memory may be internal or external to the processor, and may be connected to the processor by various well-known computer components. Further, the memory may be included in the storage medium 17, 17-1 to 17-n of the present invention. Furthermore, the term "memory" collectively refers to devices in which information is stored regardless of the type of device, and does not refer to a specific memory device.

At least one or more of the various control logics of the control units 16, 16-1 to 16-n, and 21 are combined, and the combined control logic is created by a computer-readable code system and executed by the computer. It can be recorded on a readable recording medium. The type of recording medium is not particularly limited as long as it can be accessed by a processor included in a computer. As an example, the recording medium may include a read-only memory (ROM), a random access memory (RAM), a register, a compact disk read-only memory (CD-ROM), a magnetic tape, a hard disk, a floppy disk, etc. It includes at least one selected from the group including a disk and an optical data recording device. Additionally, the code system may be stored and executed in a distributed manner on networked computers. Moreover, functional programs, codes and code segments for implementing the combined control logic can be easily deduced by programmers skilled in the art to which the present invention pertains.

In describing the various embodiments of the present invention, it is understood that components named "...part" are not necessarily physically distinct elements, but are functionally distinct elements. I have to. Accordingly, each component may be selectively integrated with other components, or each component may be divided into subcomponents for efficient execution of control logic. However, it is obvious to those skilled in the art that even if the components are integrated or divided, as long as the same function is recognized, the integrated or divided components should be interpreted as falling within the scope of the present invention.

Although the present invention has been described above with reference to limited embodiments and drawings, the technical idea of the present invention is not limited to these in any way. It goes without saying that those who have the knowledge of the present invention can make various modifications and variations within the scope of the technical idea of the present invention and the scope of the claims.

10 Management device 11 Power storage source 11-1~n Battery rack 12, 12-1 Switch 14 Battery cell 15 Sensor unit 15-1~n Sensor unit 15a Voltage measurement unit 15b Current measurement unit 15c Temperature measurement unit 16 Control unit 16- 1 to n Slave control unit 17 Storage medium 17-1 to n Storage medium 18 Communication interface 18-1 to n Communication interface 20 Management device 21 Master control unit 22 Storage medium 23 Communication interface

Claims (15)

a sensor unit for measuring operating characteristics of the power storage source; and a control unit operably coupled to the sensor unit;
The control unit includes:
(i) obtaining operating characteristic information of the power storage source from the sensor unit and determining an operating power limit of the power storage source;
(ii) While the power storage source is operating, the operating characteristic information is used to charge charging power supplied from a power conversion system (PCS) or discharging power provided to the power conversion system (PCS) side. determine the power,
(iii) the charging power or the discharging power is greater than a preset unstable power range of the power conversion system (PCS), and the charging power or the discharging power is greater than the operating power limit by a first threshold; interrupting the operation of the power storage source when the above first operation interruption condition is satisfied;
(iv) the charging power or the discharging power is within a preset unstable power range of the power conversion system (PCS), and the charging power or the discharging power is lower than the operating power limit by a second threshold; If the above second operation interruption condition is satisfied, suspending the operation of the power storage source;
A power storage source management device, wherein the second threshold is greater than the first threshold. The control unit includes:
receiving operational characteristic information including charging/discharging current, voltage, and temperature of the power storage source from the sensor unit;
summing the charging/discharging current to determine a state of charge of the power storage source;
4. Determining an operating power limit of the power storage source corresponding to the determined state of charge and the received temperature with reference to lookup information defining a correlation between a state of charge and temperature and an operating power limit. 1. The power storage source management device according to 1. The power storage source management device according to claim 1, wherein the control unit is provided with information regarding a preset unstable power range of the power conversion system (PCS) from the power conversion system (PCS). The power storage source management device according to claim 1, wherein the first threshold is between 10% and 30% of the operating power limit. The power storage source management device according to claim 1, wherein the second threshold is between 30% and 60% of the operating power limit. The power storage source management device according to claim 5, wherein the second threshold value increases as charging power or discharging power of the power storage source becomes lower. The power storage source management apparatus according to claim 1, wherein the power storage source includes first to nth battery racks. comprising first to nth slave control units installed in each of the first to nth battery racks, and a master control unit communicatively coupled to the first to nth slave control units,
Each of the first to nth slave control units acquires operating characteristic information of the battery rack to which it is attached from the sensor unit, and uses the operating characteristic information to determine the operating power limit and charging power or discharging power of the battery rack. determining and providing it to the master control unit,
The master control unit includes:
summing the operating power limit and charging power or discharging power transmitted from the first to nth slave control units to determine the overall operating power limit and the entire charging power or the entire discharging power;
the total charging power or the total discharging power is greater than a preset unstable power range of a power conversion system (PCS), and the total charging power or the total discharging power is less than the total operating power limit; is equal to or greater than a first threshold, when a first operation suspension condition is satisfied, providing an operation suspension message to the first to nth slave controllers;
the total charging power or the total discharging power is within a preset unstable power range of a power conversion system (PCS), and the total charging power or the total discharging power is less than the total operating power limit; is equal to or greater than a second threshold, when a second operation suspension condition is satisfied, providing an operation suspension message to the first to nth slave controllers;
A power storage source management device, wherein the second threshold is greater than the first threshold. A method for controlling a power storage source management device, the method comprising:
acquiring operational characteristic information of the power storage source from a sensor unit that measures operational characteristics of the power storage source;
determining an operating power limit for the power storage source using the operating characteristic information;
While the power storage source is operating, the operating characteristic information is used to determine charging power supplied from a power conversion system (PCS) or discharging power provided to a power conversion system (PCS) side. the step of
The charging power or the discharging power is greater than a preset unstable power range of the power conversion system (PCS), and the charging power or the discharging power is greater than or equal to a first threshold value than the operating power limit. suspending operation of the power storage source if a first operation suspension condition is met;
The charging power or the discharging power is within a preset unstable power range of the power conversion system (PCS), and the charging power or the discharging power is greater than or equal to a second threshold value than the operating power limit. suspending operation of the power storage source if a second operation suspension condition is met, the second threshold being greater than the first threshold;
including methods. receiving operational characteristic information including charging/discharging current, voltage, and temperature of the power storage source from the sensor unit;
summing the charging/discharging current to determine the state of charge of the power storage source;
determining an operating power limit for the power storage source corresponding to the determined state of charge and the received temperature with reference to lookup information defining a correlation between the state of charge and temperature and the operating power limit;
10. The method of claim 9, comprising: 10. The method of claim 9, further comprising providing information from the power conversion system (PCS) regarding a preset unstable power range of the power conversion system (PCS). 10. The method of claim 9, wherein the first threshold is between 10% and 30% of the operating power limit. 10. The method of claim 9, wherein the second threshold is between 30% and 60% of the operating power limit. 14. The method of claim 13, wherein the second threshold increases as charging or discharging power of the power storage source decreases. A method for controlling a power storage source management device, the method comprising:
The power storage source management device is communicably coupled to first to nth slave control units installed in the first to nth battery racks, respectively, and a master communicably with the first to nth slave control units. a controller, the method comprising:
Each of the first to nth slave control units obtains operating characteristic information from a sensor unit that measures the operating characteristics of the battery rack to which it is attached, and determines the operating power limit and charging power or discharging power of the battery rack. and providing it to the master controller;
The master control unit adds up the operating power limit and charging power or discharging power transmitted from the first to nth slave control units to determine the entire operating power limit and the entire charging power or the entire discharging power. step and
The master control unit is configured such that the total charging power or the total discharging power is larger than a preset unstable power range of a power conversion system (PCS), and the total charging power or the total discharging power is providing an operation suspension message to the first to nth slave controllers when a first operation suspension condition, which is greater than or equal to a first threshold value than the overall operating power limit;
The master control unit is configured such that the total charging power or the total discharging power is within a preset unstable power range of the power conversion system (PCS), and the total charging power or the total discharging power is within a preset unstable power range of the power conversion system (PCS). providing an operation suspension message to the first to n-th slave controllers when a second operation suspension condition, which is greater than or equal to a second threshold value than the overall operating power limit, is satisfied; a second threshold is greater than the first threshold;
the first to nth slave control units suspending the operation of the battery racks to which they are attached in response to receiving the operation suspension message;
including methods.